Pre-Lunatics delves into the moments leading up to case#0:lunatics, showcasing Ryo Kazan's unraveling psyche post-Moonlight Syndrome, Sumio Kodai's departure from HQ due to a foreboding intuition, and Tetsugoro Kusabi's contemplation of a photo featuring Toriko Kusabi and Christina. This narrative seamlessly transitions into lunatics, aligning its final pages with the commencement of the case.